[theora-dev] Request for input on the preparation of a subjective video quality comparative study

salsaman salsaman at gmail.com
Tue Sep 22 09:35:14 PDT 2009

We did a similar, but very subjective test like this for the LiVES
project a couple of years ago. It would interesting to see if your
results correlate with our findings.

We are particularly interested in comparing free codecs against
proprietary ones.

I would suggest at least the following codecs for video:

- theora
- h264
- dirac
- snow
- wmv
- xvid

and for audio:

- vorbis
- mp3
- aac

if you are interested in the container formats, I would suggest:

- avi
- ogg
- matroska
- nut


On Sun, Sep 20, 2009 at 2:40 PM, John Pisokas <john.pisokas at gmail.com> wrote:
> Hi there,
> First of all THANK YOU for putting all the effort on developing Theora! and
> all the other projects of xiph, of course.
> I am planning to conduct together with my students a subjective video
> quality comparative study of video codecs.
> The plan is to ask our friends, family and others to participate so that
> we will be looking towards a minimum of 100 participants.
> The experiments are going to start sometime towards the beginning of November.
> I suppose we will be able to use Theora 1.1 final by then, if not we will use
> a build from SVN.
> I would like to have your input on:
> 1. which codecs would you be interested in including in the study,
> 2. what encoding parameters should be used,
> 3. advise on source video material,
> 4. software that can be used for running the tests,
> 5. anything else you would like to give me input about.
> If you want to include in the study alternative implementations or setups of
> the theora encoder I will be able to include them.
> The way I envision it is that we will distribute DVDs to the participants
> which will include the test video clips and an executable that will provide
> a GUI for going through the experimental procedure so that the participants
> can run the test on their own computer setups. This will introduce an
> uncontrolled variable but it will be nevertheless more realistic than
> running all the experiments in one of our labs with the specific computer
> setup that we happen to use for our purposes.
> I would be happy to have your opinions, advice, views or anything else you
> wish.
> John
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